On appeal, the Industrial Property Court took the opposite view and explained:
“as previously resolved by this Court, numbers from 0 to 9 cannot be registered as word marks, since they allow the composition of the remaining numbers (infinite) of the system; in all other cases, numbers are perfectly registrable, and indeed, easily distinguishable from each other, because each of them represents a different amount. This reasoning justifies the registration of the figure ‘1818’ as a trade mark, given that it has its own distinctive characteristics and a particular appearance allowing it to obtain trade mark protection.”This is good news -- except perhaps for anyone who wants to register the number "8181" for goods in Class 25, which is identical to "1818! when viewed upside down.
Source: "Court Rules on Registration of Numbers as Trademarks", by Francisco Silva, Silva & Cia., Santiago, Chile, INTA Bulletin vo.69 no.18